Dresden 2026 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 20: Poster I

HL 20.3: Poster

Dienstag, 10. März 2026, 18:00–20:00, P1

Markovian vs. Full Quantum-Kinetic Approach to Phonon-Assisted Incoherent Exciton Formation in Atomically Thin Semiconductors — •Leonard Schneider, Andreas Knorr, and Henry Mittenzwey — Nichtlineare Optik und Quantenelektronik, Institut für Physik und Astronomie, Technische Universität Berlin, Hardenbergstr. 36, 10623 Berlin, Germany

Excitonic coherence decay and incoherent exciton formation in atomically thin semiconductors such as monolayer transition metal dichalcogenides are strongly influenced by the coupling between charge carriers and lattice vibrations. Based on Heisenberg's equations of motion, we derive the microscopic dynamics of excitonic transitions and incoherent exciton occupations coupled via phonon-assisted processes. For a consistent quantum-kinetical approach, we go beyond the usual one-phonon processes and include up to two-phonon-assisted and phonon-population-assisted transitions, which corresponds to a truncation of the hierarchy problem within a fourth-order Born approximation. We numerically evaluate the full quantum kinetics for the dephasing- and incoherent-exciton-generation dynamics and compare it to the corresponding Markovian limit. The corresponding influence of memory effects and multi-phonon processes is discussed in detail.

Keywords: Excitons; Exciton-Phonon Interaction; Quantum Kinetics; Transition Metal Dichalcogenides